diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ec2c917c3691..31558b901f9f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2005-08-11  James E. Wilson  <wilson@specifix.com>
+
+	* config/ia64/ia64.h (EXTRA_MEMORY_CONSTRAINT): New.
+
 2005-08-11  Jakub Jelinek  <jakub@redhat.com>
 
 	* dwarf2out.c (add_location_or_const_value_attribute): Prefer
diff --git a/gcc/config/ia64/ia64.h b/gcc/config/ia64/ia64.h
index 4e3a28003100..72fff46e5319 100644
--- a/gcc/config/ia64/ia64.h
+++ b/gcc/config/ia64/ia64.h
@@ -949,6 +949,13 @@ enum reg_class
 
 #define EXTRA_CONSTRAINT(VALUE, C) \
   ia64_extra_constraint (VALUE, C)
+
+/* Document the constraints that can accept reloaded memory operands.  This is
+   needed by the extended asm support, and by reload.  'Q' accepts mem, but
+   only non-volatile mem.  Since we can't reload a volatile mem into a
+   non-volatile mem, it can not be listed here.  */
+
+#define EXTRA_MEMORY_CONSTRAINT(C, STR)  ((C) == 'S')
 
 /* Basic Stack Layout */